针对大型齿轮的特点和在机测量的难点，研究开发了大型内齿轮在机测量的相关技术，建立了可测量大型内齿轮齿形、齿向及齿距误差的ＣＮＣ大型内齿轮在机测量系统。 Aiming at the characteristics of large gear and the difficulties in measuring the machine, the related technology of on-machine measurement of large internal gear was researched and developed. The CNC large-scale internal gear measuring system which can measure the tooth profile, tooth direction and pitch error of large- .